Fan blade and center



Apnl 7 s. A. XIPPAS FAN BLADE AND cam-rm Filed July 24. 1925 Patented Apr. 5, 1927.

' SOCRATESA, XIPPAS, OF'IPITTSBURGH, PElNNSYIlVANIA.-T

FAN BLADE AND CENTER.

Application filed July 24,

My invention relates to fan blades and centers. i

The object of the invention is to provide a center carrier or support for double curved blades or impellers for electric fans particularly those adapted to be used'withfa vertical motor.

Further objects and advantages will be more fully described herein and specifically pointed out inthe claims hereunto annexed recourse being had to the accompanying drawing forming a part of this jspecification in which Figure 1 is a plan of the completed fan blade, center or cross member showing the curved arms thereon.

Figure 2 is a side view of the center or spider.

Figure-3 is an elevation of the fan blades showing their general arrangement.

-Figure 4 is a vertical section of one of the fan blades showing the up and down curved form of the same.

Figure 5 is a cross section of one of the blades or impellers showing the curve thereof which is at right angles to that shown in Figure 4.

.Figure 6 is a perspectiveview of asingle 7 .arm of the center.

' Figure 7 is a top' plan view of the various blades 1n their respective positions when mounted upon the carrier shown in Flgure 7 1, and

Figure 8 is a side'elevational view of th blade assembly shown in Figure/7.

In the drawing like reference numerals indicate similar parts in all the several views Referringto thedrawing, 1 designates a disc forming the center or body of my improved blade support orcarrier. This body 1 hasoutwardly extending equally spaced.

curved arms 2, each of which consists of a horizontal portion 3, provided at one of its longitudinal extremities with a curved wing 4, bent at an angle to the part 3, so that the arm forms aprojection which is substantially L-shapedin cross section.

A pair of the diametrically opposite arms 2, have the wings 4 extending upwardly,

while the other pair of arms has the wings extending downwardly. Each wing is of slightly less length than the arm 2, with which it is associated, so that gaps 5 are located between the inner ends of the arms.

The body 1, is perforated at 6. to receive- 192'5. Serial No. 45,902.

the upper end of the vertical shaft 14,611

I which the fanis mounted,'and the dotted as each other blade. 'Each blade is curved up and down as shown at 11, and laterally,

as indicated at 1 2. The blades are secured to the arms 2, by means of screws or rivets which. pass through apertures 10' 'of the wings of the arms, and the curvature 12 of each blade conforms to the lengthwise curvature of the wing to which it is attached.

' From Figs. 2 and '3, it maybe seen that the downwardly extending Wings of diametrically opposite arms 2, diverge downwardly, as indicated at 13, and thewings of the other pair of diametricallyoppositearms diverge upwardly in asimilar manner. As

their height, and are secured to the diverging wings a, it will. beunderstoodthat the upwardly extending blades 9,-diverge up-' 'wardly, wl1ile the downwardly extending Owing to t blades 10, diverge downwardly. I this construction, the blades 9, when the shaft 14: is rotated counter clockwisesee Figure'1', will draw aindownwardly, while the blade 10 will draw air upwardly, and this'air is forced outwardly in a horizontal plane away fromthe shaft 14. 1

' Theblades, when mounted for operation, are usually confined by a spherical guard, (not shownihaving perforations to permit the passage of the air. In view of this fact, the extreme edges of thevarious blades are shaped to coincide with an imaginary sphere which is concentric with such a guard and, of course, of less diameter; t

From the foregoing, it is believed that the construction, operation, and advantages of the invention may be clearly understood,

the blades are curved in the direction o'f I and it is obvious that changes may bemade of substantially the same length as thearm,"

" and anotherone of said arms being provided along one of its longitudinal extremities with a downwardly extending wing of sub- I 'stantially the same length as the lastmen- ,tioned arm.

2. In a fan, a blade support comprising a centralbody portion adapted to be. mounted 2 ion a fan shaft, curved arms carried by, and 1 extending outwardly from the body portion in a substantially horizontal. plane, one of j saidarms being provided along one of its longitudinal extremities with a curved upwardly extending wing,'and another one of saidarms being provided along one of its longitud nal extremities with a downwardly extending curved wing.

' 3. In a fan, a blade support comprising acentral 'body portion adapted to be mounted arms beingarranged in pairs, each arm on on a fan shaft, arms radiating from the body portion at angles to the axis of rotation, said one pair being provided. along one of its 1ongitudi'nalextremities with an upwardly extending wing adapted to bear against a fan blade,.leach arm of the other pair being provided along one of its longitudinal extremi ties with a downwardly extendingwing adapted tobe-ar against a fan blade.

4}. In fan, ablade holder comprising a centralfbody portion adapted to be mounted on-a fan shaft, pairs of radiating arms carried by the. body portion and arranged at angles to the :axis of rotation, each arm of one pair being provided alonlg one of its 1011- gitudlnal extremities with an extending wing, each arm of' the other pair being pro- .vided along one of'its longitudinal extremitieswith an oppositely extending wing.

5. Ina fan, a blade support comprising a 1 central body portion adapted to bemounted on avertical shaft, radiating arms carried by the body portion and arranged in pairs,

7 each arm of one pair being provided along O11e..Oll'lt S longitudinal extreinitlesfwith an upwardly extending wing, and each arm' of the other pairbe ng provided along one of 7 its longitudinal extremities with a downwardly extending wing, the upwardly ex- 'tndIIlg WlDgS 'dlverging upwardly from a horizontal plane drawn through theaxis of I rotation, and the downwardly extending V wings diverging downwardly from. another horizontal plane drawn through the axis of' rotation. i

f r 6. In a fan, a vertical shaft,

blade support, mounted on the'shaft and comprising a central'body portion, and radiatingarms arranged in pairs, each arm of one pair beingprovidedalong one of its longitudinalmounted on the shaft, and including radiat- W ing arms provided with upwardly and down wardly extending wings, upwardly and downwardly extending blades carried by the arms and bearing against said wings, each ofsaid blades beingv curved inthe direction of its height and in the direction of its width. 8. A fan, including a shaft, a blade diverg ing from a plane drawn through theaxis of rotation of the shaft, a second blade diverging from a plane drawn through the axis'of rotation of the shaft and at an angle to the first mentioned plane, and a single element connectedto the shaft and theblades substantially in a plane drawn at right angles to the axis of rotation of the shaft, for uniting the blades'to the shaft.

9. A fan, including a shaft, a pair of convexo-concave blades diverging from a plane drawn through the axis of rotation of the shaft, a second pair of convexo-concave blades diverging from a plane drawn through the axis of rotation ofthe shaft: at

an angle to the first mentioned plane, and a spider extending ina plane at right angles to the shaft and connected of the blades.

10. A fan, including a plurality of con-.

vexo-concave blades radiating in diiferentdirections from the center ofv an imaginary sphere, said blades having their extreme edges shaped to coincide with the periphery of said sphere, a shaft intersecting the center of said sphere, and means for connecting said. blades to said shaft. 7 V

11. A fan, including a shaft, a flat blade thereto and to" all ioo holder mounted onthe shaft and including curved ,radlatlng arms provided with 0ppositely extending wings, each of which follows the curvature of its respective arm,

and oppositely extending blades carried by j the arms through said wings, each of said blades being curved in the direction of its height and in the direction of its width.

In testimony whereof I have hereunto affixed my signature.

I SOGRATES A. XIPPAS 

